Type-writing machine.



A. W. SMITH.

TYPE WRITING MACHINE.

APPLICATION FILED JUNE 17, 1913 Patented Feb. 9, 1915.

3 SHEETSSHEET l.

mmmmm Q 60% if B INVENTEIRL WITNEEISES:

HEATTEIR'NEY A. W. SMITH.

TYPE WRITING MACHINE.

APPLICATION IILED JUNE 17, 1913.

PatentedFeb.9,1915.

3 SHEETS-SHEET 2.

WITNESEEE: I lNvENTn-R;

Y M M HISATTEIRNEY A. W. SMITH.

TYPE WRITING MACHINE.

APPLIOATION FILED JUNE 17, 1913.

Patented Feb. 9, 1915.

3 SHEETS-SHEET 3' WITNEEEIE'S:

HIEATTURNEY lug ARTHUR W. SMITH, OF NEW YORK, N. Y., ASSIGNOR TOREMINGTON TYPEWRITER COMPANY, OF ILION, NEW YORK, A CORPORATION OF NEXVYORK.

TYPE-WRITING MlACI-IINE.

Application filed June 17, 1913.

To all whom it may concern:

Be it known that I, ARTHUR W. SMrrn, citizen of the United States, andresident of the borough of Manhattan, city of New York, in the county ofNew York and State of New York, have invented certain new and usefulImprovements in 'lype-Vriting Machines, of which the following is aspecitication.

My invention relates to typewriting and similar machines, and moreparticularly to the ribbon mechanism of such machines.

My invention has for its principal object to provide improved ink ribbonmechanism, including a ribbon vibrator mechanism for a visibletypewriter, ribbon feed mechanism and guiding means. The ribbon vibratorpreferably acts also as a type guide but this fact is not essential tosome of the other features of the invention.

One object of my invention is to provide an automatic reverse for thelongitudinal feed of the ribbon.

Another object is to produce ribbon mechanism that shall be simple andinexpensive to manufacture but thoroughly good in point of durabilityand satisfactory inoperation.

T o the above and other ends my invention consists in certain featuresof construction, and combinations and arrangements of parts, all ofwhich will be fully set forth herein and particularly pointed out in theclaims.

In the accompanying drawings I have shown enough of a front striketypewriter to illustrate the embodiment of my invention therein.

In said drawings, Figure 1 is a fore and aft vertical section of themachine. Fig. 2 is a top plan view of the rear part of the machine withthe upper flange of one of the ribbon spools sectioned away. Fig. 3 is afront elevation of the machine in vertical section. Fig. 4 is a planview of the ribbon feed mechanism as it would appear with the top platesectioned away from above it. Fig. 5 is a top plan view of part of saidfeed mechanism and of the automatic reverse mechanism but taken insection a little lower than Fig. 4; that is to say, a certainreciprocatory plate and its Specification of Letters Patent.

Patented Feb. 9, 1915.

Serial No. 774,133.

guides shown in Fig. 4 are sectioned away in F ig. 5. Figs. 6 and 7 areviews similar to Fig. but showing parts of the mechanism in dilierentpositions. Fig. 8 is an isometric view of one of the spools with itsupper flange sectioned away and showing also certain associated devices.Fig. 9 is a section through the top plate and the ribbon feeding andreversing mechanism about on the line of Fig. (3. Fig. 10 is a verticalsection through the axis of one of the ribbon spools. Figs. 1--l are ona reduced scale and Figs. 5-9 are on an enlarged scale.

My invention is applicable or adaptable in whole or in part to varioussorts of typewriters and other machines that print from an ink ribbon.The machine shown in the drawings has a main frame comprising a basepart 1, corner posts 2, side bars 3, one on each side of the machine andconnecting the front and back corner posts at their tops, a forward topplate 4 and a rear top plate 5. Each of the side bars 3 has a depressedpart 6 forming a U-shaped opening for the carriage 7. Said carriage hasa main body bar 8 grooved at its front and rear edges to constituterails which, through the instrumentality of balls or rollers 10, areadapted to travel back and forth on stationary grooved rails 11 and 12.These latter are supported by the depressed part 6 of the side bars3 sothat the rails, both stationary and traveling, are depressed below thelevel of the top plates 4 and 5. The carriage is fed across the machineby a spring drum 13 having a cord 14 wound thereon and running upwardover a pulley 15 and connected at its free end to the underside of therail 8. The step-lcy-step travel of said carriage is controlled byescapement mechanism not shown and which can be of any suitable sort.The rail 8 has end pieces secured thereto and designated specifically inthe drawings by the reference numeral 7 and in which there is journaledthe axle 16 of a roller platen 17.

Types 18 on the free ends of type bars 20 are adapted to strike againstthe front face of the platen 17. Said type bars arepivoted at 21 in ashiftable segment 22 mounted on arms 23 which are pivoted at 24170 posts25 constituting, in a way, extensions of the side bars 3. The bars 23are connected by a cross bar 26 in which are pivoted a series ofsub-levers 27 which are connected by links 28 with the type bars 20.Said sub- .levers 27 are connected by vertical push links 30 with keylevers 31 of the first order having printing keys 32 on their forwardends. Said key levers are pivoted on rods 33 mounted at their ends in aframe 34 secured in the base of the machine, and said key levers areprovided with returning springs 35. The tv e action above brieflydescribed, is not claimed herein but is claimed in another pendingapplication of mine. As far as the present invention is concerned, saidtype action can be of any other suitable character.

A universal bar 36 lies above the key levers 31 back of their pivots 33,said universal bar being supported at its ends on two arms 37, which aresecured to a rock shaft 38, which rock shaft is journaled in brackets 40secured, as by screws 41, Fig. 1, to the base 1 of the main frame. Atthe middle of the machine a third arm 42 is provided, connected at itsrear end with the shaft 38 and having the bar 36 also passing throughsaid arm, and said arm 42 extends forward from the universal bar, asshown in Fig. 1, and it has a link 43 connected to its free end. Theupper end of said link is pivoted to a lever 44 of the first order,which lever ispivoted at 45 to a bracket 46 extending toward the rear ofthe machine beneath the carriage and beneath the rail 11. The bracket 46is a rearward extension of a block 47 which is secured by screws 48 tothe front face of the stationary rail 11. Said block has two ears 50into which are threaded two pivot screws 51, which pivot screws passthrough suitable cars 52 of a ribbon vibrator 53 so that said vibratoris pivoted to said block on said screws 51. The lever 44 has itsforwardly extending arm connected by means of a link 54 with an ear 55bent off from the depending arm 56 of the vibrator 53. The lever 44 andthe link 54 are so related as to constitute the elements of a toggle.such that when the universal bar 36 is moved upward-by the operation ofone of the printing keys the rear arm of the lever 44 is moved upward bythe link 43 and the forward arm of said lever is moved downward. Thetoggle 4454 is normally bent upward, as shown in Fig. 1, and it isstraightened by the operation of a key. The construction is such thatthe operation of the vibrator takes place almost entirely in the firstpart of the key stroke, or at least in the first part of the movement ofthe universal bar 36, and that during the last part of the key strokethe vibrator is either entirely or substantiallv stationary on accountThe construction is toggle does not sensibly change the position of thevibrator. This fact is of advantage in a ribbon vibrator but it is ofespecial importance in the vpresentinstance for the reason that saidvibrator is used not only as a vibratory ribbon carrierbut it alsoconstitutes a guide for the type bars 20 and types'18. Said vibrator atits upper part is forked, as shown in Fig. 3, each of the branches 57thereof having an inclined ribbon guiding slot 58 therein, and anopening 59 into said slot, and each of said branches is formed also witha forwardly projecting car 60, and said ears are beveled or inclined toconstitute a center guide for the type bars. The opening between saidears is wide in front and tapers until it is just the width of the typeblock on the end of the type bar so that it steers the type bar toprinting position with precision. As the type bars near the ends of thesegment do not swing in the same plane as the vibratory ribbon and typeguide, it is desirable that said guide remain substantially stationaryuntil the type bar has got out of it, a condition that is brought aboutby the toggle mechanism described. It will be noted that the guidingcars 60 for the type bars are in front of the horizontal part of theribbon 61 so that it is the sides of the type blocks themselves that areguided by the ears 60, and this is so whether the segment be in one ofits three shifted positions or another.

The ribbon guiding means includes a plate 62 of sheet metal which issecured to the forward face of the rail 11. Said plate 62 is situatedbetween the block 47 and the front face of said rail and is, therefore,held in position by the same screws 48 as said block.

The plate 62 at its upper part is bent off toward the rear of themachine, as shown in Fig. 1. At its middle said plate has rivetedthereto a cross plate 63 made in the form of a T, the upright part ofwhich is riveted to the plate 62, and the transverse arms of which arebent forward as shown in Fig. 1, the forward edge of said arms beingfoldedaback, as shown at 64. The ribbon 61 runs horizontally across fromone of the inclined guides 58 to the other back of the arms 57, thenceforward through said guides and downward underneath the transverse armsof the plates 63, and thence backward beneath the platen 17 and abovethe carriage bar 8 and the rails 11 and 12. It will thus be seen thatthe ribbon runs back through the carriage to the ribbon spools 65 and66. These spools are arranged horizontally side by side, being mountedon spindles or stud shafts 67 projecting upward throu h the back topplate 5 in which said shafts are journaled. As shown in Fig. 10, each ofthese stud shafts has a flange 68 that rests on the top of a bushing 70secured in a hole in the top plate 5. Below said bushing each of theshafts 67 has a reduced part 71 on which fits a toothed wheel 72 whichis secured in position by a headed screw 73 threaded into the lower endof the shaft. The upper end of said shaft has a reduced part 74 forminga shoulder from which at one point a pin 75 projects upward to act as aspline or tooth to cause the spool to rotate with the shaft. Each ofsaid spools comprises an upper and a lower flange, and, as will be seen,the hole through the'lower flange is larger than the hole through theupper flange so that said lower flange fits over the large part of thestud shaft 67 and the upper flange fits over the reduced part 71, beingformed with a notch into which the pin 75 projects. It will be seen thatthis spool when in position on the machine is positively connected toturn with the shaft, but the spool can be instantly removed by simplylifting it off of said shaft. The two flanges are secured together byfour posts 76 shouldered and riveted to the flanges and preferably acore 77 is loosely inserted just inside the posts and in such positionthat it will surround the stud shaft 67. This socalled core may consistsimply of a strip of sheet or ribbon metal cut off to a suitable lengthand rolled into a cylindrical form. The function of said core is toprevent the ink ribbon, in case it bulges in between the posts 76, fromgetting into such position as to be caught on the stud shaft 67 whenputting the spool on to the machine.

It will be perceived that the ribbon on the spools has its edges up anddown, whereas when it passes under the guide 63 it is flat verticallyand its edges are right and left so that each line of ribbon runningforward from one of the spools must have a quarter twist in it. In orderto make such a twist run true the horizontal guide for the ribbon shouldstand pretty exactly on a level with the m ddle of the coil of ribbon onthe spool. To this end a wire guide 78 is provided, said guideconsisting of a yoke-shaped piece of wire having two forwardly andupwardly extending arms, the rear ends of which are secured by screws orrivets to the top plate 5 and the upper surface of the cross wire lyingas has been described, that is to say, in a plane parallel with theplanes of the upper and lower flanges of the ribbon spools and midwaybetween said planes. The ribbon is led forward from the spools over thiswire 78, thence forward and downward beneath the guide 63, thence upwardin front of the arms 57 of the vibrator, and thence horizontally betweensaid arms at the back of the vibrator.

The ribbon feed mechanism is mostly mounted on the underside of the topplate 5. Said mechanism comprises a sliding plate 80, Figs. 4 and 9,which plate has its upper surface lying against the lower surface of theplate 5 and which is guided for a back and front sliding motion by meansof guide plates 81 secured as by rivets 82 to the under side of saidplate 5, said plates 81 having ears that lie beneath the plate 80. InFigs. 4, 5, 6 and 7 the parts are shown in top view with the plate 5sectioned away and in the last three of these figures the plate isitself sectioned away, its outline only being indicated by broken lines.A double driving dog or rack 83 is pivoted to the forward end of theplate 80 by means of a post 84, which post is doubly shouldered as shownin Fig. 9, the lower reduced end of the post passing through the dog 83to which it is secured by riveting. The middle section of the postpasses with freedom to turn through the plate 80. Said post projectsupward through a slot 85 in the front part of the plate 5 for reasonsassociated with the automatic reversing of the ribbon feed, as will morefully appear hereinafter. In order to hold the rear end of the dog 83 upagainst the plate 80, said dog is formed with an arc-shaped slot 86through which a headed rivet 87 projects downward from the plate 80. Therear part of the dog 83 lies between the two toothed wheels 72 and it isformed with teeth constituting two short racks 88 and 89, the first forcooperation with the right-hand and the second for cooperation with theleft-hand one of the wheels 72. The dog can be rocked about its pivot 84to engage it with one or the other of these wheels and when it is inengagement with one of the wheels the front and back reciprocations ofthe plate 80 will cause that wheel to be rotated, leaving the other onefree. In order to press the dog yieldingly against either one of thewheels 72, a centering dog or pawl 90 is pivoted at 91 to the undersideof the plate 80 and said dog has a rounded part that is pressed towardthe front of the machine by a spring 92 having one end inserted in asuitable hole in the dog 90 and the other end connected with a rivet 93projecting from the plate 80. The rear end of the dog 83 is formed witha point 94, and the dog 90 engages on one side or the other of thispoint according to the shifted-position of the dog 83. In the drawingssaid dog 83 is shown in position for operating the right-hand ribbonspool 66.

The plate 80 is reciprocated back and forth by means of a long lever 95pivoted at 96 to the under side of the plate 5 and near the right-handside of the machine, as will be understood from Fig. 4; and said leverextends across the machine beneath the wheels 72 and the slide 80 andother parts that have just been described, the lever 95 terminating nearthe left-hand side of the machine where it is provided with a dependingpost or arm 97 to the lower end of which is connected a cord or chain 98which, as shown inTFig. 1,'extends forward from the post 97 to a pulley100 journaled on a screw 101 secured to the side bar 3. From said pulleythe cord 98 extends downward where it is led over a small drum 102constituting a sort of hub or sleeve of the spring drum 13 that drivesthe typewriter carriage. The hub or drum 102 and the spring drum 13 arejournaled on an axle or shaft 103, Figs. 1 and 3, which at one end ispivoted in the "base part 1 of the typewriter and at its inner end ispivoted in an arm 104 projecting toward the rear of the machine from theframe 34. This shaft 103 is or may be connected with means, not shown,whereby it can be turned and held in adjusted position in order toregulate the tension of the spring in the drum. Said cord 98 can haveits ends secured to the drum in any suitable manner. As here shown asort of pawl or clutch device 105 is pivoted to the Side of the drum 13at 106 in suchposition that if the cord 98 be drawn under this dog andthe dog pressed toward the drum 102, the cord will be caught and wedgedin between the end of the dog and the surface of the drum and thus heldrigidly in position. The cord 98 is wound on the drum 102 in a directionthe opposite of that in which the cord 14 is wound on the drum 13. Theconstruction is such that when the carriage is moving toward the leftthe cord 98 is unwinding from the drum 102 and the left-hand end of thelever 95 is at liberty to move toward the rear of the machine and, aswill presently appear, to carry with it the slide 80 and connecteddevices and thus to turn a ribbon spool.

The lever 95 is moved in the manner just described by means of a stiffspring 107 connected at one end to an arm 108 of the lever 95 and at theother end to a. post 109 dependingl from the plate 5.

he means by which the lever 95 pushes the slide 80 and connected partstoward the rear of the machine when the typewriter carriage is movingtoward the left, consists of a post 110, Figs. 6 and 9, which is rivetedinto the slide 80 and depends therefrom.

Said post is cut away at its upper part to.

accommodate the dog 90 and spring 92 and it is formed with a shoulder111, Fig. 9, against which the rear edge of the lever 95 is adapted tostrike and it is also formed with a flange or car 112 that projectsforward beneath said lever to prevent the latter from dropping downward.At the time when the parts are moving toward the rear the dog 83 is heldin engagement with one of the wheels 7 2 by means of the dog 90.

The means whereby the lever 95 moves the slide 80 and its connectedparts toward the front of the machine, consists of a pin 113 projectingdownward from the dog 83 into an opening 114 in the lever 95. The rearpart of this opening is formed with two V- shaped notches 115 and 116leaving a sharp point between them so that when the lever moves towardthe front of the machine, as indicated in Fig. 6, the inclination of oneof these notches causes the pin 113 and the dog 83 to be moved towardthe right or toward the left as the case may be to move said dog out ofengagement with the wheel 72 before the slide 80 begins to move towardthe front of the machine. In Fig. 5 the lever 95 is shown moving towardthe rear and driving the right-hand wheel 72, and it will be seen thatthe pin 113 stands at the right of the center of the notch 116. When thelever starts toward the front of the machine there is a little lostmotion between the post 110 and the pin 113, the taking up of whichmoves said pin to the left to the position shown in Fig. 6 so that thedog 83 moves toward the front of the machine entirely out of engagementwith the wheel. lVhen the lever starts back toward the rear, however,the centering action of the notch 116 ceases and the dog 83 yields tothe dog 90 and is moved back into engagement with the wheel, as shown inFig. 5. As the two notches 116 and 115 are at the right and left-handsides respectively of the center position of the pin 113 the dog 90 willalways restore the dog 83 into engagement with the same wheel until thedog shall by some means have been moved past the center position intoposition for cooperation with the other wheel. This can obviously bedone by hand and I have also provided automatic means for the purpose.

It will be perceived that the special ribhon-feeding spring 107 is putunder tension by the return motion of the carriage, that said springfeeds the ribbon during the lettor-feed movements of the carriage, andthat any excess of power in said spring over and above what is requiredto feed the ribbon, acts through the cord 98 and drum 102 to assist inpropelling the carriage.

The ribbon reversing mechanism comprises two arms 117 and 118 projectingtoward the left and right respectively from the post 84 above the levelof the top plate 5 and in fact at such a level and in such position thatthe ribbon, in passing from the spools over the wire 78, is just abovethese arms. It will be noted that the said arms 117 and 118 are in aconvenient position for manipulation by hand and they are also inposition for operation by automatic means comprising two hooks 120, oneat each end of the ribbon and, therefore, one associated with each ofthe ribbon spools. These hooks can be variously constructed andvariously connected with the ribbon. As here shown said hooks are notconnected primarily with the ink ribbon but each one is connected with aloop of tape 121, which loop passes around one of the posts 76 of theribbon spool and the two ends of the tape are fastened together and tothe hook by means of ears 122 bent back from the sheet metal from whichthe hook is made and compressed over the ends of the tape. Projectingbeyond the ends of said tape said piece of sheet metal is formed into apointed hook 123 over which the end of the ribbon 61 is adapted to becaught. It is by this means that the end of the ribbon is fastened tothe spool and it will be seen that the hook 120 therefore remainsconnected permanently with the spool.

When the ribbon is exhausted from one of the spools the parts assume theposition shown in Figs. 7 and 8 in which the lefthand hook 120 is runout until it. is caught under the arm 117. It will be seen that the hookcatches the arm from the back so that said hook can act on the arm onlywhen the slide 80 is moving toward the rear. At this time the dog 83 andconnected parts stand either in the position shown in Fig; 6, which isthe position they occupy at the beginning of a backward motion, or elsein the position shown in Fig. 5. In either case, when by the backwardmotion of the slide 80 the arm 117 is brought into engagement with thehook 120, the pin 113 is not seated in the notch 116 where it would behard to dislodge but is held in its right-hand position only by theaction of the dog 90 under the control of the light spring 92. At thistime a very light pull on the arm 117 is sufficient to throw the dog 83and pin 113 to the lefthand side of the center and thus bring the dog 83into action on the left-hand wheel 72. At the particular time when thereverse takes place the resistance to the rocking of the dog is soslight that no harm is done by the pull on the ribbon.

The teeth of the wheel 72 and of the racks 88 and 89 can be varied to acertain extent in form. As here shown they have the form of rather sharpratchet teeth and as a matter of fact in the machine they are, ifanything, somewhat sharper than shown in the drawings. The ratchet teethof the wheels are set, however, in the reverse of the ordinarydirection, that is to say, the faces of the teeth of the racks 88 and 89cooperate, not with the abrupt faces of the teeth 72, but with theinclined faces of said teeth. This is in order to facilitate the reverseof the feed. It was found that with the abrupt faces of one set of teethengaging the abupt faces of the other set of teeth that a considerablefrictional resistance was offered to the pulling of the rack teeth outof engagement with the teeth of the wheel. By the arrangement shown thisfrictional resistance is entirely done away with. At the same time theinclined faces of said teeth are sufficiently steep so that the racks donot slip but turn the teeth with certainty. In the machine from whichthese drawings were made the inclined faces of said teeth are perhaps,as indicated above, somewhat more nearly radial than shown in thedrawlngs.

In threading the machine the spools can be simply set on the shaftsleaving a loop of ribbon between them. This loop is led forward over theWire 73 and beneath the platen and the paper feeding devices asso ciatedtherewith and is drawn toward the front of the machine as a loop orfold. The right-hand branch of this loop is caught under the right-handarm of the plate 63 and the left hand branch under the lefthand arm ofsaid plate. The loop is then led upward and is slipped in through theopenings in the inclined guides 58 into the position shown in thedrawings. It will be perceived that the ribbon can very readily beremoved from the machine by slipping it out of said guides 58 and outfrom under the cross guide 63 and lifting the spools off of theirshafts. Another pair of spools with a fresh ribbon or with anotherribbon of different sort of ink or a different color of ink can then besubstituted. The spools can be thus removed and replaced without anychange in the winding and so that when the same ribbon is put back intothe machine the use of it can proceed from the point where it was left03 last time, Or approximately so.

Various changes can be made in the details of construction andarrangement without departing from my invention.

What I claim as new and desire to secure by Letters Patent, is

1. In a typewriting machine, the combination of a carriage, a springdrum for operating said carriage, a smaller drum connected with saidspring drum, a cord adapted to be wound onto and unwound from saidsmaller drum as the carriage moves back and forth, a reciprocatory partcontrolled by said cord, and a ribbon spool driven by said reciprocatorypart.

2. In a typewriting machine, the combi nation of a carriage, a springdrum for operating said carriage, a smaller drum connected with saidspring drum, a cord wound on said smaller drum, a lever operated in onedirection by said cord, a spring for operating said lever in the otherdirection, and a ribbon spool operated by said lever.

3. In a typewriting machine, the combination of a carriage, a springdrum for operating said carriage in one direction, a smaller drumconnected 'with said spring drum, a cord wound on said smaller drum insuch a way that said cord is unwinding from said drum at the time whenthe carriage is being moved by said drum, and is wound on said drum bythe return motion of the carriage, a spring put under tension by saidcord when said cord is wound on the drum, and a ribbon spool driven bysaid spring. v

4. In a typewriting machine, the combination of a carriage, a spring forfeeding said carriage in letter space direction, ribbon feed mechanismincluding a special spring for driving the ribbon feed, and meansconnecting said special spring to the carriage and whereby the returnmotion of the carriage puts said special spring under tension, theconnection between said special spring and said carriage continuingduring the letter feed movement of the carriage, whereby any excess ofpower in said special spring over and above-what is required for thedriving of the ribbon,-tends to assist in the driving of the carriage inletter feed direction.

5. In a typewriting machine, the combination of a carriage, a spring fordriving said carriage in letter feed direction, ribbon feed mechanismcomprising a reciprocatory part so connected to the carriage that thereturn motion of the carriage operates said part in one direction, aspring connected with said part and put under tension by such motionof-said part due to the return of the carriage, and means operated bysaid part when said part is driven by said spring for feeding theribbon,'the connection between said special spring and said carriagecontinuing during the letter teed movement of the carriage, whereby anyexcess of power in said spring over and above what is required to feedthe ribbon, tends to assist in the letter feeding move ient of thecarriage.

6. In a typewriting machine,the combination of a carriage, a spring drumfor operating said carriage in one direction, a cord wound on said drumand connected with said carriage, a smaller drum connected with saidspring drum, a cord wound on said smaller drum so as to act contrary tothe first mentioned cord, a lever to which said second cord isconnected, a spring acting on said lever and tending to move it in thedirection opposite to that ofsaid cord, and a ribbon mechanism driven bysaid lever.

7. In a typewriting machine, the combination of two ribbon spools havingtoothed wheels disposed edge to edge, a dog lying between said wheelsand having two racks to engage said wheels alternatively, a carriage,means for moving said dog in wheel-turning direction continually duringthe travel of the carriage from right to left in letter feed direction,and means operated by the return movement of the carriage for returningsaid dog idly in the other direction.

8. Inatypewriting machine, the combination of a carriage, two ribbonspools having toothed wheels disposed edge to edge, a rack-toothed dogadapted for engagement with said wheels alternatively,and means forreciprocating said dog in unison with the reclprocatlons of saidtypewriter carriage, the dog moving in spool-turning direction contnually while the carriage is moving from right to left in letter feeddirection and moving reversely when the carriage is bemg returned.

9. In a typewriting machine, the combination ot a typewriter carriage,two ribbon spools having toothed wheels, a rack-toothed dog adapted forengagement with said wheels alternatively, means for reci rocating salddo in unison with the reciprocat10n of said typewriter carriage, the dogmovmg one way when the carriage is moving in letter feed direction andthe other way when the carriage is being returned, and means for movingsaid dog into engagement with one of said wheels while the carriage ismoving in letter feed direction and for holding said dog out ofengagement while the carriage is being returned.

10. The combination of a pair of ribbon spools and their wheels, a dogshiftable to engage either one of said wheels, a recipro catory devicefor reciprocating said dog, means whereby said device when moving in onedirection moves the dog out of engagement with whichever wheel it isoperating, and means for moving said dog back into engagement with thesame wheel when said device is moving in the other direction.

11. The combination of two ribbon spools and their wheels, a dogshiftably mounted between said wheels so as to engage either one ofthem, a reciprocatory device, and means connecting said reciprocatorydevice with said dog and comprising the pin 113 and the notches 115 and116 coiioperating with said pin whereby upon the return stroke of saiddevice said dog is moved out of engagement with one of said wheels bythe co-action of said pin with one of said notches or from the other ofsaid wheels by the co-action of said pin with the other of said notchesas the case may be.

12. The combination of a pair of ribbon spools and their wheels, :1 dogshiftable into engagement with either wheel, a reciprocatory device, andlost motion connections between said device and said dog whereby saiddevice operates said dog and one of the wheels when moving in onedirection and moves said dog out of engagement when moving in the otherdirection.

13. The combination of two ribbon spools and their wheels, the slide 80,the dog 83 pivoted to said slide and the actuating device 95 having lostmotion connection with the slide and dog, the lost motion being utilizedto move the dog into and out of engagement.

14. The combination of a pair of ribbon spools having ratchet-toothedwheels connected therewith, a dog for engagement with either of saidwheels, and means for shifting said dog from one Wheel to the other,said dog engaging the oblique faces of said ratchet teeth.

15. The combination of a pair of ribbon spools, ratchet-toothed wheelsconnected therewith, a dog having two ratchet-toothed racks forengagement with said wheels, and means for shifting said dog from onewheel to the other, the rack teeth engaging the oblique faces of theteeth of the wheels.

16. The combination of a pair of ribbon spools and wheels connectedtherewith, a reciprocatory slide, a dog pivoted to said slide andshiftable into engagement with either one of said wheels, means foryieldingly holding said dog in either of its two shifted positions, areciprocatory device for operating said slide and dog, means wherebysaid evice moves said slide in one direction, and means whereby saiddevice operates said dog and through it the slide in the otherdirection, the last recited means including means whereby said devicemoves said dog outof engagement.

17. The combination of a pair of ribbon spools mounted side by side onparallel axes,

means for turning said spools, and means for guiding the ribbon from onespool to the other, said guiding means including a bar parallel with theplanesof the flanges of said spools and situated halfway between saidplanes whereby the ribbon is given a quarter twist between each spooland said bar.

18. Ina typewriting machine, the combination of a carriage comprisingalongitudinal frame bar, a platen mounted in said carriage, ribbon spoolsmounted behind said carriage, a ribbon vibrator in front of saidcarriage, and means for conducting said ribbon from said spools to saidvibrator through said carriage.

19. In a typewriting machine, the combination of a main frame comprisingdepressed stationary carriage rails, a carriage traveling on said rails,a platen mounted in said carriage, ribbon spools behind said carriage,and means for guiding the ribbon from said spools between said rails andsaid platen and to the front of said platen.

20. In a typewriting machine, the combination of a main frame, adepressed stationary rail, a carriage traveling along said rail, aplaten, a ribbon vibrator pivoted to said rail and having means forguiding an ink ribbon to the front of the platen, ribbon spools at theback of the carriage, and means for guiding the ribbon from said spoolsto said vibrator above said depressed rail and below the platen.

21. In a typewriting machine, the combination of a ribbon vibrator, andoperating means therefor comprising a toggle which is straightened inthe latter part of the operation of said means whereby said vibrator issubstantially stationary in the latter part of the operation of saidoperating means.

22. In a typewriting machine, the combination of a ribbon vibrator, aseries of type bars, a center guide for said type bars formed on saidvibrator, and means for op erating said vibrator at each stroke of atype bar, said operating means including a toggle that is straightenedin the latter part of said stroke whereby in the last part of the strokeof the type bar toward the platen and in the first part of its returnstroke said vibrator and type guide are substantially stationary.

23. In a typewriting machine, the combination of a series of type bars,a vibratory guide for said type bars, and means for operating said guideat each stroke of the type bar, said operating means including a togglethat is straightened in the latter part of the operation of saidoperating means whereby said center type guide is substantiallystationary at the time when it is engaged by a type bar.

24. In a typewriting machine, the combination with spool-turningmechanism including a stud shaft, of a ribbon spool capable of beingplaced on and removed from said shaft at will, said spool comprising twoflanges, posts connecting said flanges and around which the ribbdn iswound, and an annulus or core loosely mounted inside of said posts andsurrounding said shaft and serving to prevent the ribbon, where itbulges in between said posts, from catching on said shaft.

25. In a typewriting machine, the combination of ink ribbon mechanismcomprising a ribbon spool, said spool having two flanges each with ahole through it and one of said holes larger than the other,spool-turning devices comprising a shaft on which said spool isdetachably mounted, said shaft having a relatively large part forcooperation with the larger one of said holes and a relatively smallpart at its end for cooperation with the smaller of said holes, andmeans to cause said spool to turn with said shaft when mounted on it,said means, however, allowing the spool to be lifted freely off of theshaft.

26. In a typewriting machine, the combination of a pair of ribbon spoolsmounted side by side, a lever arranged to vibrate in a plane parallelwith the faces of said spools and said lever extending transversely ofthe lever to vibrate in unison with the bac forth motion of saidcarriage, and means whereby said lever drives said spools.

Signed at the borough of Manhattan city of New York, in the county ofNew Y and State ofNew York, this 16th day of means for causin said June,A. DJ. 1913.

ARTHUR W. SMITH.

and

Witnesses CHARLES E. SMITH,

ork, ETHEL M. VVELLs.

